MS-DOS (Microsoft Disk Operating System) is a clone of CP/M for the 8088 put together in six weeks by hacker Tim Paterson, who is said to have regretted it ever since. It has numerous features, including vaguely UNIX-like but rather broken support for subdirectories, I/O redirection, and pipelines, were hacked into version 2. 0 and subsequent versions; as a result, there are two or more incompatible versions of many system calls, and
MS-DOS programmers can never agree on basic things like what character to use as an option switch or whether to be case-sensitive. The resulting mess is now the highest-unit-volume OS in history. Often known simply as DOS, which annoys people familiar with other similarly abbreviated operating systems (the name goes back to the mid-1960s, when it was attached to IBM's first disk operating system for the 360). The name further annoys those who know what the term operating system does (or ought to) connote; DOS is more properly a set of relatively simple interrupt services. Research MS-DOS
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Research MS-DOS